Republican presidential candidate Donald Trump speaks to the crowd at a town hall meeting December 12, 2015 in Aiken, South Carolina. The South Carolina Republican primary is scheduled for February 20, 2016.Sean Rayford/Getty Images

Republican presidential frontrunner Donald Trump released a letter from his physician, who claimed the bombastic real estate mogul "showed only positive results" in his latest medical exam. Dr Harold Bornstein, who has been Trump's doctor for 25 years, added that the candidate's blood pressure and lab results were "astonishingly excellent" and that he "has had no significant medical problems".

"If elected, Mr Trump, I can state unequivocally, will be the healthiest individual ever elected to the presidency," the internal medicine and gastroenterology specialist said in the letter dated 4 December. According to CNN, Bornstein is not believed to have evaluated any past presidents.

The letter revealed that Trump's blood pressure is 110/65, which is considered a better than average reading. The leading GOP candidate has never suffered from any cancer and has only had one surgery in his life. Trump reportedly had an appendectomy when he was 10-years-old. Bornstein said Trump's cardiovascular health was "excellent".

In very Trump-like fashion, Bornstein declared that Trump's "physical strength and stamina are extraordinary." Trump does not have a history of ever using alcohol or tobacco products the doctor added before giving his stamp of approval. The letter makes no mention of Trump's alleged bone spurs in his feet, which earned him a medical deferment during the Vietnam War.

According to CNN, the leading GOP candidate's health has been scrutinised in the past given Trump's admitted lack of exercise and non-strict diet. "I eat what I like," Trump told Bloomberg Politics in November.

In a statement along with the letter, Trump highlighted his "stamina," which he has brought up in the past. "People have been impressed by my stamina, but to me it has been easy because I am truly doing something that I love. Our country will soon be better and stronger than ever before," he said. Trump added that he had "great genes" and that his parents "had very long and productive lives."

Trump has maintained the lead in an overcrowded Republican field, but has had the occasional challenge from retired neurosurgeon Ben Carson and Texas Senator Ted Cruz. Trump, Carson and Cruz — along with six other candidates — will participate in the fifth GOP debate on 15 December in Las Vegas.